Portion of an electronic mouse



FIG. 1 is a perspective view of a portion of an electronic mouse showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken line showings of portions of the electronic mouse, including the wheel well, side button and rear patch, are made for illustrative purposes only, and form no part of the claimed design. 

The ornamental design for a portion of an electronic mouse, as shown and described. 